Bought 11 Pro Max 256GB Midnight Green in early March last year after my precious Xs Max was stolen from me.
Absolutely loving the 11 Pro Max, the speed, battery life and camera have all been phenomenal

to the point where I am happy to stick it out with it possibly another year or 2 until something worth upgrading arrives.
Looking at things like battery tests I see the 11 Pro Max is still among the best, it really set the bar and I hope the next iPhone I get will take the bar higher, the 12 range seems to be about the same if not a slight regression. The camera in the 12 Pro Max is something to behold though, I think Apple have set themselves up for the next couple of generations of iPhone with that new large sensor.
I will probably jump on the 14 Pro Max if it shows a true jump (Xs Max to 11 Pro Max type jump) in Battery Life, Screen (120hz ProMotion) and hopefully both TouchID and FaceID on it.
Love the 12 generation design, it looks great, more sophisticated and svelte, I hope they keep this design and make it more ergonomic, I’m sure by the 14 range they will have refined this design to a fine art like they did with the X design in the 11 series.